KR20180011626A - Gas Treatment System and Vessel having same - Google Patents

Abstract

According to an embodiment of the present invention, a gas treatment system includes: a first flow path in which liquefied gas stored in a liquefied gas storage tank is supplied to an upper portion of a re-condenser; a second flow path in which the liquefied gas stored in the liquefied gas storage tank is supplied to a lower portion of the re-condenser; a third flow path through which evaporative gas generated in the liquefied gas storage tank is supplied to the re-condenser; and a controller for controlling a flow of the liquefied gas in the first flow path and the second flow path in accordance with an internal pressure of the re-condenser, and controlling the internal pressure of the re-condenser.

Description

TECHNICAL FIELD [0001] The present invention relates to a gas treatment system and a vessel including the same,

The present invention relates to a gas treatment system and a vessel including the same.

Liquefied natural gas (Liquefied natural gas), Liquefied petroleum gas (Liquefied petroleum gas) and other liquefied gas are widely used in place of gasoline or diesel in recent technology development.

Liquefied natural gas is a liquefied natural gas obtained by refining natural gas collected from a gas field. It is a colorless and transparent liquid with almost no pollutants and high calorific value. It is an excellent fuel. On the other hand, liquefied petroleum gas is a liquid fuel made by compressing gas containing propane (C3H8) and butane (C4H10), which come from oil in oil field, at room temperature. Liquefied petroleum gas, like liquefied natural gas, is colorless and odorless and is widely used as fuel for household, business, industrial, and automotive use.

Such liquefied gas is stored in a liquefied gas storage tank installed on the ground or stored in a liquefied gas storage tank provided in a ship which is a means of transporting the ocean. The liquefied natural gas is liquefied to a volume of 1/600 The liquefaction of liquefied petroleum gas has the advantage of reducing the volume of propane to 1/260 and the content of butane to 1/230, resulting in high storage efficiency. The temperature and pressure necessary for driving the engine using such liquefied gas as fuel may be different from the state of the liquefied gas stored in the tank.

In addition, when LNG is stored in a liquid state, some LNG is vaporized and boil off gas (BOG) is generated as heat penetration occurs in the tank. Such evaporation gas may cause problems in a liquefied gas processing system. In order to solve the problem by discharging the evaporation gas to the outside (in the past, the evaporation gas was simply discharged to the outside in order to lower the tank pressure by lowering the tank pressure), the problem was solved. However, .

 In recent years, researches and developments have been actively conducted on utilization methods such as recycling the generated evaporated gas through a liquefied gas, liquefying it, and supplying it to the engine as a technique for efficiently processing the evaporated gas.

The present invention has been made to improve the prior art, and an object of the present invention is to provide a gas processing system and a ship including the same, which effectively supply liquefied gas and / or evaporated gas from a liquefied gas storage tank to a customer .

A gas processing system according to the present invention comprises: a first flow path in which liquefied gas stored in a liquefied gas storage tank is supplied to an upper portion of a recondenser; A second flow path in which liquefied gas stored in the gas-liquid storage tank is supplied to a lower portion of the recondenser; A third passage through which the evaporated gas generated in the liquefied gas storage tank is supplied to the recondenser; And a control unit for controlling the flow of liquefied gas in the first flow path and the second flow path in accordance with the internal pressure of the re-condenser and controlling the internal pressure of the re-condenser.

Specifically, the third flow path may supply the evaporative gas generated in the liquefied gas storage tank to the recondenser in accordance with the internal pressure of the liquefied gas storage tank.

Specifically, the recondenser further includes a packing part for recondensing the evaporated gas supplied through the third flow path and the liquefied gas supplied through the first flow path, And the second flow path may be connected to the lower side of the packing portion of the recondenser.

Specifically, a first valve provided in the first flow path; A second valve provided in the second flow path; And a recondenser internal pressure measuring sensor for measuring the internal pressure of the recondenser, wherein the controller adjusts the opening degree of the first and second valves according to the internal pressure of the recondenser measured through the re-condenser internal pressure measuring sensor .

Specifically, when the internal pressure of the recondenser is higher than the preset pressure, the control unit controls the opening degree of the first valve to be greater than the opening degree of the second valve, When the pressure is lower than the pressure, the opening degree of the first valve can be controlled to be less than the opening degree of the second valve.

The desiccant may further include a fourth flow path connecting the recondenser and the customer, wherein the customer is a first customer, connected to the fourth flow path by supplying and consuming liquefied gas from the recondensor; And a second consumer that consumes and supplies the evaporative gas from the recondenser.

Specifically, a fifth flow path connects the second customer and the recondensor; And a third valve disposed on the fifth flow path.

Specifically, when the internal pressure of the recondenser is higher than the preset pressure, the control unit opens the opening of the third valve, and evaporation gas flowing into the recondenser through the fifth flow passage is supplied to the second demanding unit As shown in FIG.

Specifically, the first demander may be a high-pressure gas injection engine (MEGI), and the second demander may be a low-pressure boiler (DF boiler).

The apparatus may further include a spraying unit disposed on the packing unit inside the recondenser and spraying the liquefied gas connected to the first flow path and supplied from the first flow path to the packing unit.

Specifically, the second flow path may be branched from the first flow path.

Specifically, an internal pressure regulating three-way valve provided at a branch point between the first flow path and the second flow path and including an inlet opening and an outlet opening to the first and second flow paths; And a recondenser internal pressure measuring sensor for measuring the internal pressure of the recondenser, wherein the controller can adjust the opening degree of the three-way valve according to the internal pressure of the recondenser measured through the internal pressure measuring sensor of the recondenser.

Specifically, when the internal pressure of the recondenser is higher than the preset pressure, the control unit controls the outlet opening degree of the internal pressure adjusting three-way valve to the first flow passage to be more open than the outflow opening degree to the second flow passage Pressure regulating three-way valve to the first flow passage so as to be less than the outflow opening degree into the second flow passage when the internal pressure of the recondenser is lower than the preset pressure.

A fourth flow path connecting the recondenser and the customer; An evaporative gas compressor provided on the third flow path and for pressurizing evaporative gas generated in the liquefied gas storage tank; A boosting pump for supplying the liquefied gas stored in the liquefied gas storage tank to the recondenser; A high pressure pump provided on the fourth flow path for pressurizing the liquefied gas supplied from the recondenser to a high pressure; And a high-pressure vaporizer provided on the fourth flow path for vaporizing the liquefied gas supplied from the high-pressure pump.

The oil separator may further include an oil separator disposed downstream of the evaporative gas compressor on the third flow passage and separating the oil in the evaporative gas discharged from the evaporative gas compressor.

Specifically, it may be a vessel characterized by including the gas treatment system.

Specifically, the first flow path is a liquefied gas upper connection line, the second flow path is a liquefied gas lower connection line, the third flow path is a vapor gas discharge line, The first valve is a first internal pressure regulating valve of the recondenser, the second valve is a second internal pressure regulating valve of the recondenser, and the second valve is a second internal pressure regulating valve of the recondenser, Valve, and the third valve may be an evaporation gas supply valve.

The gas treatment system and the vessel including the gas treatment system according to the present invention can effectively supply the liquefied gas and / or the evaporated gas from the liquefied gas storage tank to the customer, thereby enhancing system stability and reliability.

1 is a conceptual view of a ship including a gas treatment system according to a first embodiment of the present invention.
2 is a conceptual view of a ship including a gas treatment system according to a second embodiment of the present invention.
3 is a conceptual view of a ship including a gas treatment system according to a third embodiment of the present invention.
4 is a conceptual view of a ship including a gas treatment system according to a fourth embodiment of the present invention.
5 is a conceptual view of a ship including a gas treatment system according to a fifth embodiment of the present invention.
6 is a conceptual view of a ship including a gas treatment system according to a sixth embodiment of the present invention.
7 is a conceptual view of a ship including a gas treatment system according to a seventh embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, the liquefied gas may be LPG, LNG, or ethane, and may be, for example, LNG (Liquefied Natural Gas), and the evaporation gas may refer to BOG (Boil Off Gas) such as natural vaporized LNG.

The liquefied gas can be referred to irrespective of the state change, such as liquid state, gas state, mixed state of liquid and gas, supercooled state, supercritical state, and the like. Further, it is apparent that the present invention is not limited to the liquefied gas to be treated, but may be a liquefied gas processing system and / or an evaporative gas processing system, and the systems of the following drawings may be applied to each other.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a conceptual view of a ship including a gas processing system according to a first embodiment of the present invention, FIG. 2 is a conceptual view of a ship including a gas processing system according to a second embodiment of the present invention, Fig. 7 is a conceptual view of a ship including a gas processing system according to a third embodiment of the present invention. Fig.

1 to 3, a gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a boosting pump 20, a recondenser 30, an evaporative gas compressor 40, a high-pressure pump 50, a high-pressure vaporizer 60, first and second consumers 71 and 72, a tank internal pressure control unit 81, a recondenser internal pressure control unit 82, a recondenser level control unit 83, And an oil separator 90.

In the embodiment of the present invention, the vessel (not shown) may be an LNG carrier, a bulk line, or a container ship. When the vessel is a container ship, the liquefied gas storage tank 10 may be a B type tank. It is not limited.

The sensors 831 to 836 and the valves 801 to 807 correspond to the control units 81 to 83 to be described later, And can be operated by transmitting and receiving information through a wired or wireless connection.

Hereinafter, a gas processing system 1 according to an embodiment of the present invention will be described with reference to Figs.

Prior to describing the individual configurations of the gas processing system 1 according to the embodiment of the present invention, the basic flow paths for organically connecting the individual configurations will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

In the embodiment of the present invention, the liquefied gas discharge line L1, the liquefied gas upper connection line L1a, the liquefied gas lower connection line L1b, the liquefied gas branch line L1c, the evaporated gas discharge line L2, The gas supply line L3, the evaporation gas supply line L4, the evaporation gas adjustment line L5, the liquefied gas return line L6, and the evaporation gas branch line L7. Valves 801 to 807 capable of adjusting the opening degree may be provided in the respective flow paths, and the supply amounts of the evaporation gas or the liquefied gas may be controlled according to the opening degree control of the valves 801 to 807.

The liquefied gas discharge line L1 can supply the liquefied gas stored in the liquefied gas storage tank 10 to the recondenser 30 by connecting the liquefied gas storage tank 10 and the recondenser 30. More specifically, the liquefied gas discharge line L1 may be branched to the liquefied gas upper connecting line L1a and the liquefied gas lower connecting line L1b to be described later and may be connected to the recondenser 30, .

The liquefied gas upper connecting line L1a is separated from the end of the liquefied gas discharge line L1 and connected to the upper side of the packing section 301 of the recondenser 30 and has a recoil first internal pressure regulating valve 803 And the pressure inside the recondenser 30 can be adjusted.

The liquefied gas lower connection line L1b is branched at the end of the liquefied gas discharge line L1 to be connected to the lower side of the packing section 301 of the recondenser 30 and is provided with the recompression second internal pressure regulating valve 804 And the pressure inside the recondenser 30 can be adjusted. Here, the liquefied gas upper connecting line L1a and the liquefied gas lower connecting line L1b may be provided with a pressure-regulating three-way valve 807 which is a three-way valve instead of the third and fourth valves 803 and 804.

The liquefied gas branch line L1c is branched downstream from the booster pump 20 on the liquefied gas discharge line L1 and is reconnected to the liquefied gas storage tank 10 and may have a liquefied gas recovery valve 802 , The level of the liquefied gas in the recondenser (30) can be adjusted.

The details of the internal pressure regulation of the re-condenser 30 of the liquefied gas upper connection line L1a and the liquefied gas lower connection line L1b and the liquefied gas level control inside the recondenser 30 of the liquefied gas branch line L1c Will be described in detail below in the control sections 81 and 82. [

The evaporative gas discharge line L2 connects the liquefied gas storage tank 10 and the recondenser 30 and can include an evaporative gas compressor 40 and an oil separator 90 and is connected to the liquefied gas storage tank 10 Can be supplied to the recondenser (30).

The liquefied gas supply line L3 connects the recondenser 30 and the first customer 71 and may include a high pressure pump 50 and a high pressure vaporizer 60 and is recycled The first liquefied gas can be supplied to the first customer.

The evaporation gas supply line L4 connects the recondenser 30 and the second consumer site 72 and supplies the evaporated gas that has not been recondensed in the recondenser 30 to the second consumer.

The evaporation gas control line L5 may branch off from the evaporation gas compressor 40 on the evaporation gas discharge line L2 and may be connected to the evaporation gas supply line L4 and may include an evaporation gas control valve 805 And when an overpressure is applied to the internal pressure of the re-condenser 30, the evaporation gas flowing in the evaporation gas discharge line L2 can be supplied to the evaporation gas supply line L4.

The liquefied gas return line L6 connects the recondenser 30 and the liquefied gas storage tank 10 and can return the liquefied gas recycled to the recondenser 30 to the liquefied gas storage tank 10 . At this time, the liquefied gas return line L6 can be used when the first customer 71 stops or abnormally operates.

That is, the liquefied gas return line L6 allows the liquefied gas and the evaporated gas to be continuously supplied to the recondenser 30 even if the first customer 71 stops, The liquefied gas stored in the liquefied gas storage tank 30 can be returned to the liquefied gas storage tank 10, and the system can be stably maintained.

The evaporation gas branch line L7 can branch at the downstream of the high-pressure vaporizer 60 of the liquefied gas supply line L3 to connect the second demander 72 and can supply the vaporized liquefied gas When atmospheric pressure is generated in the gas pressure, it is possible to supply at least a part of the vaporized liquefied gas supplied from the high-pressure vaporizer 60 to the second customer.

That is, when the pressure of the vaporized liquefied gas supplied to the first customer 71 is equal to or higher than the predetermined pressure, the vaporized gas branch line L7 is supplied to the vaporizing gas branch line L6 on the liquefied gas supply line L3 supplied to the first customer 71 The vaporized liquefied gas can be supplied to the second customer 72, thereby maximizing the stability of the system.

Hereinafter, the individual configurations that are organically formed by the above-described respective lines (L1 to L7) to implement the gas processing system 1 will be described.

The liquefied gas storage tank 10 stores a liquefied gas or an evaporated gas to be supplied to the first and second consumers 71 and 72. The liquefied gas storage tank 10 must store the liquefied gas in a liquid state, at which time the liquefied gas storage tank 10 may have the form of a pressure tank.

In this embodiment, the evaporation gas generated due to the evaporation of the liquefied gas in the liquefied gas storage tank 10 is pressurized by the evaporation gas compressor 40 and supplied to the recondenser 30 to be supplied to the liquefied gas storage tank 10 It is possible to utilize the stored liquefied gas as the fuel of the consumers (71, 72). Therefore, the gas processing system (1) of the present invention can efficiently manage the evaporation gas.

The boosting pump 20 can first pressurize the liquefied gas stored in the liquefied gas storage tank 10 and supply it to the recondenser 30.

Specifically, the booster pump 20 is provided between the liquefied gas storage tank 10 and the recondenser 30 on the liquefied gas discharge line L1, and supplies the liquefied gas stored in the liquefied gas storage tank 10 to the re- (30).

At this time, the boosting pump 20 may be provided inside the liquefied gas storage tank 10 or may be provided at a position lower than the level of the liquefied gas stored in the liquefied gas storage tank 10. The boosting pump 20 may be a stationary displacement type pump having a stationary or centrifugal type and a fixed RPM.

The boosting pump 20 can pressurize the liquefied gas stored in the liquefied gas storage tank 10 to 6 to 8 bar and supply it to the recondenser 30. Here, the boosting pump 20 may pressurize the liquefied gas discharged from the liquefied gas storage tank 10 so that the pressure and temperature may be somewhat higher, and the pressurized liquefied gas may still be in a liquid state.

The recondenser 30 is provided between the evaporating gas compressor 40 and the high pressure pump 50 and between the boosting pump 20 and the high pressure pump 50 and supplies the liquefied gas and the evaporation gas And is supplied to the high-pressure pump 50.

Specifically, the recondenser 30 is supplied with the evaporated gas pressurized by the evaporative gas compressor 40 at a pressure of about 6 to 8 bar and is pressurized by the boosting pump 20 at a pressure of about 6 to 8 bar The evaporated gas can be recycled through the relatively low temperature liquefied gas supplied with the gas, and the re-condensed evaporated gas can be supplied to the high-pressure pump 50.

The re-condenser 30 mixes the evaporated gas generated from the liquefied gas storage tank 10 and the liquefied gas stored in the liquefied gas storage tank 10 to transfer the liquefied gas cold heat at a low temperature to re-condense the evaporated gas Can be used.

At this time, the recondenser 30 may be in the form of a pressure vessel capable of withstanding a pressure of 6 to 8 bar. That is, the re-condenser 30 supplies the evaporation gas and the liquefied gas through the evaporative gas compressor 40 and the boosting pump 20 at a pressure of about 6 to 8 bar (or 6 to 15 bar) The recondensation efficiency is improved more than that of the liquefied gas, the recondensation is performed while maintaining the pressure, and the compressed air is supplied to the high-pressure pump 50 to lower the compression load of the high-pressure pump 50.

As described above, in the embodiment of the present invention, since the evaporative gas is additionally supplied to the recondenser 30 and recycled and used as fuel, it is not necessary to provide a forced vaporizer used when the fuel is low, The cost reduction effect and the system configuration are simplified, and the driving reliability is increased.

Also, the recondenser 30 may include a packing portion 301 and a spray portion 302 inside the container.

The packing part 301 may be provided at the center of the interior of the recondenser 30 and may include a liquefied gas supplied onto the liquefied gas upper connection line L1a and an evaporated gas supplied onto the evaporated gas discharge line L2 A member such as gravel may be formed inside to widen the surface area of contact. That is, the packing portion 301 forms numerous voids through the gravel formed therein, and the area in which the liquefied gas flows into contact with the evaporation gas can be increased. Through this, the packing part 301 can increase the heat exchange efficiency between the liquefied gas and the evaporated gas and improve the recondensation rate.

Here, the recondenser 30 may be connected to the liquefied gas upper connecting line L1a at an upper position with respect to the packing unit 301, and may be connected to the liquefied gas lower connecting line L1b at a lower position. At this time, the liquefied gas flowing through the liquefied gas upper connecting line (L1a) flows into the packing section (301) to re-condense the evaporated gas, and the liquefied gas flowing through the liquefied gas lower connecting line (L1b) And is stored intact in the condenser 30.

Therefore, in the embodiment of the present invention, by regulating the flow rate of the liquefied gas entering the liquefied gas upper connecting line L1a and the liquefied gas lower connecting line L1b, the recondensation rate of the evaporated gas in the recondenser 30 So that the internal pressure of the recondenser 30 can be controlled. Details thereof will be described later in the control units 81 and 82. [

The spray part 302 may be provided on the upper side of the packing part 301 and extend from the end of the liquefied gas upper connection line L1a to the interior of the recondenser 30 and may be connected to the liquefied gas upper connection line L1a, It is possible to inject the liquefied gas through the packing part 301. [

The spray unit 302 can increase the contact area of the liquefied gas and the evaporation gas by spraying the liquid liquefied gas and can perform a similar role to the packing unit 301. [

The evaporative gas compressor (40) pressurizes the evaporative gas generated in the liquefied gas storage tank (10). Specifically, the evaporative gas compressor 40 is provided between the liquefied gas storage tank 10 and the recondenser 30 on the evaporative gas discharge line L2, and supplies the evaporated gas generated in the liquefied gas storage tank 10 It can be pressurized to about 6 to 8 bar and supplied to the recondenser 30.

The evaporation gas compressor (40) is provided in a plurality of stages to pressurize the evaporation gas at multiple stages. For example, three evaporation gas compressors (40) are provided to pressurize the evaporation gas at three stages. The example three-stage compressor is only one example and is not limited to the three stages.

At this time, the evaporative gas compressor 40 can pressurize the evaporative gas of about 1 bar to 2 bar to about 6 to 8 bar by the LD (Low Duty) compressor, and the evaporative gas is discharged to the recondenser 30 through the evaporative gas discharge line Can be supplied.

In addition, the evaporative gas compressor 40 may be pressurized to about 6 bar to 8 bar with a screw-type or reciprocal-type compressor. Screw type or reciprocate type compressors can effectively pressurize and supply a certain amount of evaporated gas irrespective of the pressure to be discharged, and it is easy to control the flow rate of the evaporating gas to be discharged as compared with the centrifugal type compressor There is one advantage.

In the embodiment of the present invention, an evaporative gas cooler (not shown) may be provided at each rear end of the evaporative gas compressor 40. When the evaporation gas is pressurized by the evaporation gas compressor 40, the temperature may also rise with the pressure increase. Therefore, in this embodiment, the evaporation gas cooler can be used to lower the temperature of the evaporation gas again. The evaporative gas cooler may be installed in the same number as the evaporative gas compressor 40, and each evaporative gas cooler may be provided downstream of each evaporative gas compressor 40.

In the embodiment of the present invention, when the evaporation gas compressor 40 is provided in parallel to increase the amount of the evaporation gas generated in the liquefied gas storage tank 10, When one of the evaporator 40 and the evaporator 40 malfunctions or shut down, the other evaporator gas compressor 40 can be operated to efficiently receive and process the evaporated gas generated in the liquefied gas storage tank 10 .

The high-pressure pump 50 can be a high-pressure pump that can pressurize the liquid recycled from the recondenser 30, pressurize it to a high pressure, and pressurize it to about 200 to 400 bar. Specifically, the high-pressure pump 50 may be provided between the recondenser 30 and the high-pressure vaporizer 60 on the liquefied gas supply line L3 and may be provided with a pressure of about 6 to 8 bar from the recondenser 30 The liquefied gas recycled in the energized state may be supplied and pressurized to a high pressure of about 200 to 400 bar to be supplied to the high-pressure vaporizer 60.

The high pressure pump 50 can pressurize the high pressure pump 50 at a high pressure of about 200 to 400 bar and supply the liquefied gas to the first demand place 71 through the high pressure vaporizer 60 to supply the liquefied gas to the pressure demanded by the first demand place 71 , Whereby the first customer (71) can produce the thrust through the liquefied gas.

The high-pressure pump 50 can pressurize the liquefied gas discharged from the recondenser 30 at a high pressure, and phase change the liquefied gas to a supercritical state having a temperature and a pressure higher than a critical point. At this time, the temperature of the liquefied gas in the supercritical state may be minus 20 degrees or less, which is relatively higher than the critical temperature.

Alternatively, the high-pressure pump 50 can pressurize the liquefied gas in the liquid state to a super-cooled liquid state by pressurizing it at a high pressure. Here, the liquefied gas in the subcooled liquid state is a state in which the pressure of the liquefied gas is higher than the critical pressure and the temperature is lower than the critical temperature.

Specifically, the high-pressure pump 50 pressurizes the liquid-state liquefied gas discharged from the recondenser 30 to 200 bar to 400 bar at a high pressure so that the temperature of the liquefied gas becomes lower than the critical temperature, Phase state to a subcooled liquid state. Here, the temperature of the liquefied gas in the subcooled liquid state may be minus 140 degrees to minus 60 degrees lower than the critical temperature.

In the embodiment of the present invention, when the high-pressure pump 50 is provided in parallel so that one of the high-pressure pumps 50 malfunctions or shut down, the other high-pressure pump 50 can operate So that the evaporated gas recycled to the recondenser 30 can be reliably or stably supplied to the first customer 71.

The high-pressure vaporizer 60 is provided on the liquefied gas supply line L3 and is capable of vaporizing high-pressure liquefied gas discharged from the high-pressure pump 50. Specifically, the high-pressure vaporizer 60 is provided on the liquefied gas supply line L3 between the first customer 71 and the high-pressure pump 50 to vaporize the high-pressure liquefied gas supplied from the high-pressure pump 50 And can supply the first demanders 71 in a desired state.

The high-pressure vaporizer 60 may use glycol water, sea water, steam, engine exhaust gas, or the like as a fuel for vaporizing the liquefied gas. The high-pressure vaporized liquefied gas Can be supplied to the first customer (71) without pressure fluctuation.

The first customer 71 uses the liquefied gas or the evaporated gas supplied from the liquefied gas storage tank 10 as the fuel. That is, the first customer 71 needs liquefied gas or evaporative gas, and can be driven using the raw material as the raw material. The first customer 71 may be, but is not limited to, an engine (e.g., a MEGI engine as a high pressure gas injection engine)

The first customer 71 may be connected to the liquefied gas storage tank 10 through the liquefied gas discharge line L1 to the liquefied gas supply line L3 and may be connected to a liquefied gas Or may be supplied with an evaporative gas.

The first customer 71 can use vaporized gas or liquefied gas which is pressurized to about 200 to 400 bar by the high-pressure pump 50 and the high-pressure vaporizer 60 and uses vaporized gas or liquefied gas of about 300 bar Pressure engine, and may be an engine for directly rotating a propeller shaft (not shown) to drive a propeller (not shown) or an engine for generating other power.

As the piston (not shown) inside the cylinder (not shown) reciprocates by the combustion of the liquefied gas, the engine rotates the crankshaft (not shown) connected to the piston and the shaft Can be rotated. Therefore, as the propeller connected to the propeller shaft rotates when the first customer 71 is driven, the hull can move forward or backward.

The first customer 71 can receive the driving force by receiving the recondensed liquefied gas and the state of the liquefied gas can be changed according to the state demanded by the first customer 71. [

Further, the first customer 71 may be a heterogeneous fuel engine in which heterogeneous fuel can be used. A heterogeneous fuel engine is typically a two-stroke engine driven by a diesel cycle. In this diesel cycle, air is compressed by the piston, the compressed high-temperature air is ignited by the pilot fuel, and the remaining high-pressure gas is injected to cause the explosion.

In this case, HFO (Heavy Fuel Oil) or MDO (Marine Diesel Oil) is used as the ignition fuel, and the ratio of the ignition fuel to the high-pressure gas is about 5:95, and the injection amount of the ignition fuel can be adjusted from 5 to 100% Do. Therefore, the ignition fuel is also usable as the driving fuel for the engine.

That is, when the injection amount of the ignition fuel is about 5%, evaporative gas (or heated liquefied gas; about 95%) is mainly used as the engine driving fuel, and when the injection amount of the ignition fuel is 100% Fuel (oil) is all used.

At this time, when the injection amount of the ignition fuel is 50% (and about 50% of the evaporation gas), the ignition fuel is ignited first to generate the calorific value instead of being mixed with the evaporative gas or the liquefied gas and flowing into the engine, The remaining evaporation gas flows in and explodes to produce the calorific value, thereby producing the calorific value required for driving the engine.

The second consumer site 72 uses the evaporative gas supplied from the liquefied gas storage tank 10 as fuel. That is, the second customer 61 needs evaporation gas and can be driven using the same as a raw material. The second customer 72 may be, but is not limited to, a generator (e.g., DFDG), a gas-fired unit (GCU), a boiler (e.g.

Concretely, the second customer 72 may be connected to the re-condenser 30 via the fourth line L2 and may be connected to the second condenser 30 via the evaporator or the evaporative gas compressor 40, The evaporation gas is supplied to the evaporation gas supply line L4 through the evaporation gas control line L5 and supplied to the second customer site 72 to be used as fuel .

In addition, the second customer site 72 may be a heterogeneous fuel engine in which a heterogeneous fuel can be used, so that not only evaporation gas but also oil can be used as fuel. However, since the evaporation gas and oil are not mixed and supplied, As shown in FIG. This is to prevent the mixture of two materials having different combustion temperatures from being mixed, thereby preventing the efficiency of the second customer 72 from deteriorating.

The tank internal pressure control unit 81 controls the evaporative gas compressor 40 in accordance with the internal pressure of the liquefied gas storage tank 10. At this time, the embodiment of the present invention may further include a storage tank pressure measuring sensor 836 for measuring the internal pressure of the liquefied gas storage tank 10. The storage tank internal pressure measurement sensor 836 may be provided inside or outside the liquefied gas storage tank 10 as a pressure measurement sensor.

Specifically, the tank internal pressure control unit 81 controls the evaporative gas throughput of the evaporative gas compressor 40 according to the internal pressure of the liquefied gas storage tank 10 measured through the storage tank internal pressure sensor 836, The internal pressure of the tank 10 can be controlled.

The tank internal pressure control unit 81 controls the internal pressure of the liquefied gas storage tank 10 so that the evaporated gas compressor 40 can control the evaporated gas generated in the liquefied gas storage tank 10 from the preset throughput And when the internal pressure of the liquefied gas storage tank 10 is lower than the preset pressure, the evaporative gas compressor 40 controls the evaporated gas generated in the liquefied gas storage tank 10 to be more than the predetermined throughput It can be controlled so as to be less.

At this time, the evaporation gas compressor 40 is controlled under the control of the tank internal pressure control unit 81 so that the processing flow rate within the predetermined time is constant (the internal pressure of the liquefied gas storage tank 10 is very small, The operation flow of the liquefied gas storage tank 10 can be controlled in accordance with the internal pressure of the liquefied gas storage tank 10 without depending on the internal pressure of the recondenser 30, Can be controlled only depending on the operation mode. For this purpose, the evaporative gas compressor 40 may be controlled by variable frequency drive (VFD).

Conventionally, in order to control the internal pressure of the recondenser, the amount of evaporated gas supplied from the liquefied gas storage tank is controlled through the supply amount. In this case, there is a problem in that the recondensation does not occur according to the amounts of the evaporated gas and the liquefied gas, and the recondenser does not exhibit the recondensation function.

Specifically, the amount of evaporative gas supplied to the re-condenser conventionally varies depending on the amount of liquefied gas stored in the liquefied gas storage tank, and the amount of liquefied gas supplied to the recondenser varies depending on the amount of fuel consumed by the first consumer 71 . If both the amount of liquefied gas and the amount of evaporated gas supplied to the recondenser fluctuates, it becomes very difficult to control the pressure fluctuations inside the recondenser and the fluctuation of the liquid level of the stored liquefied gas.

Therefore, in the embodiment of the present invention, the amount of the evaporated gas supplied to the recondenser 30 is controlled so as to be supplied in dependence on the internal pressure of the liquefied gas storage tank 10 without depending on the internal pressure of the recondenser 30 . That is, in the embodiment of the present invention, the evaporation gas discharge line L2 can supply the evaporation gas generated in the liquefied gas storage tank 10 to the recondenser 30 without depending on the internal pressure of the recondenser 30 have.

In the embodiment of the present invention, the amount of the evaporated gas flowing into the recondenser 30 is not changed (the internal pressure of the liquefied gas storage tank 10 is much less fluctuating than the internal pressure of the recondenser 30) It is very easy to calculate the amount of the evaporated gas to be recycled in the re-condenser 30, and thus it is very easy to control the pressure fluctuations in the re-condenser 30 and the fluctuation of the liquid level in the liquid level.

The tank internal pressure control unit 81 controls the opening degree of the evaporation gas control valve 805 in accordance with the relative ratio of the evaporation gas to the liquefied gas in the recondenser 30 so that evaporation in the evaporation gas control line L5 The gas flow can be controlled.

Specifically, the tank internal pressure control unit 81 opens the opening of the evaporation gas regulating valve 805 when the relative abundance ratio of the evaporation gas to the liquefied gas in the recondenser 30 is higher than the preset ratio, It is possible to control so that at least a part of the evaporation gas on the condenser L2 is supplied to the evaporation gas supply line L4 without being supplied to the recondenser 30 and the relative ratio of the evaporation gas to the liquefied gas in the re- The opening degree of the evaporation gas control valve 805 is closed to control at least a part of the evaporation gas on the evaporation gas discharge line L2 to be supplied to the recondenser 30. Here, the flow rate control for adjusting the opening degree of the evaporation gas control valve 805 can be controlled through the value measured by the evaporation gas flow rate measurement sensor 831.

The re-condenser internal pressure control section 82 controls the liquefied gas flow in the liquefied gas upper connecting line L1a and the liquefied gas lower connecting line L1b in accordance with the internal pressure of the recondenser 30, . At this time, the embodiment of the present invention may further include a re-condenser internal pressure measuring sensor 833 for measuring the internal pressure of the recondenser 30. The re-condenser internal pressure measuring sensor 833 may be provided inside or outside the recondenser 30 as a pressure measuring sensor.

Specifically, the re-condenser withstand pressure control section 82 controls the liquefied gas upper connecting line L1a and the liquefied gas lower connecting line L1b according to the internal pressure of the recondenser 30 measured through the recondenser pressure measuring sensor 833, It is possible to control the internal pressure of the re-condenser 30 by adjusting the opening degrees of the first internal pressure regulating valve 803 and the second internal pressure regulating valve 804, respectively.

When the internal pressure of the recondenser 30 is higher than the preset pressure, the recondenser internal pressure control unit 82 controls the opening degree of the recondenser first internal pressure regulating valve 803 to be larger than the opening degree of the recondenser second internal pressure regulating valve 804 And when the internal pressure of the recondenser 30 is lower than the preset pressure, the opening degree of the recondenser first internal pressure regulating valve 803 is controlled to be smaller than the opening degree of the recondenser second internal pressure regulating valve 804 It can be controlled to be opened. Here, the flow rate for adjusting the opening degree of the recondenser first internal pressure regulating valve 803 and the recondenser second internal pressure regulating valve 804 can be controlled through the value measured by the liquefied gas flow rate measuring sensor 832.

At this time, the recondenser internal pressure control section 82 controls the opening degree of the recondenser first internal pressure regulating valve 803 to be larger than the opening degree of the recondenser second internal pressure regulating valve 804, The evaporation gas supply valve 806 is opened to control the evaporation gas supplied through the evaporation gas supply line L4 to be supplied to the second consumer 72 in the re-condenser 30 .

2, the re-condenser withstand pressure controller 82 controls the liquefied gas upper connection line L1a and the first b-th line 82a according to the internal pressure of the recondenser 30 measured through the recondenser internal pressure measuring sensor 833, The internal pressure of the re-condenser 30 can be controlled by adjusting the opening degree of the internal pressure-adjusting three-way valve 807 (see FIG. 2) installed at the branch point of the flow path 1b. At this time, the pressure-regulating three-way valve 807 controls the flow of the liquefied gas from the liquefied gas discharge line L1, the flow-out opening through which the liquefied gas flows out into the liquefied gas upper connecting line L1a (The outflow opening to the liquefied gas lower connection line L1b) and the outflow opening (the outflow opening to the liquefied gas lower connection line L1b) through which the liquefied gas flows out into the liquefied gas lower connection line L1b.

When the internal pressure of the recondenser 30 is higher than the preset pressure, the re-condenser withstand pressure control unit 82 controls the outflow opening into the liquefied gas upper connecting line L1a to be larger than the outflow opening into the liquefied gas lower connecting line L1b And when the internal pressure of the re-condenser 30 is lower than the preset pressure, the outlet opening to the liquefied gas upper connecting line L1a is controlled to be less than the outlet opening to the liquefied gas lower connecting line L1b .

That is, in the embodiment of the present invention, when the internal pressure of the recondenser 30 is increased through the control of the re-condenser withstand pressure controller 82, the amount of liquefied gas flowing into the packing portion 301 of the recondenser 30 (Increasing the amount of the liquefied gas flowing into the recondenser 30 through the liquefied gas upper connecting line L1a compared to the liquefied gas lower connecting line L1b) causes a large amount of recondensation to occur, 30 to reduce the internal pressure of the recondenser 30.

When the internal pressure of the recondenser 30 is reduced, the amount of the liquefied gas flowing through the packing portion 301 of the recondenser 30 is increased, (By increasing the amount of liquefied gas flowing into the recondenser 30 through the gas connection line L1b), thereby increasing the amount of evaporative gas present in the recondenser 30, 30 to increase the internal pressure of the valve.

Therefore, in order to solve this problem, when the pressure inside the recondenser is decreased, the makeup gas or the blackit gas, which is an inert gas such as nitrogen, is additionally supplied should. Therefore, there is a problem that the construction cost is increased and the space for installation is additionally required, and the utilization of the space in the ship is lowered.

In order to solve such a problem, in the embodiment of the present invention, it is controlled in the same manner as the control of the re-condenser withstand pressure controller 82 to control all of the cases where the pressure inside the re-condenser 30 increases or decreases, It is possible to efficiently use the recondenser 30, and it is possible to reduce the construction cost and maximize the space utilization in the ship. (That is, in the embodiment of the present invention, the liquefied gas is used without using the evaporation gas in order to control the pressure inside the recondenser 30.)

The re-condenser level control section 83 controls the liquefied gas flow in the liquefied gas discharge line L1 and the liquefied gas branch line L1c according to the level of the liquefied gas stored in the recondenser 30, Of the liquefied gas.

In the embodiment of the present invention, a recondenser water level sensor 834 for measuring the level of the liquefied gas stored in the recondenser 30 and a flow rate sensor (not shown) for discharging the liquid discharged from the booster pump 20 on the liquefied gas discharge line Ll And a liquefied gas discharge flow rate sensor 835 for measuring a liquefied gas discharge flow rate. The recondenser water level sensor 834 may be provided inside or outside the recondenser 30 as a level sensor (level sensor), and the liquefied gas discharge flow rate sensor 835 may be provided with a liquefied gas discharge May be provided between the branch points of the booster pump 20 and the liquefied gas branch line L1c on the line L1.

Specifically, the re-condenser level control unit 83 controls the amount of liquefied gas recovered in each of the liquefied gas branch lines L1c according to the level of the liquefied gas inside the recondenser 30 measured through the recondenser water level sensor 834 The opening degree of the valve 802 can be adjusted to control the liquefied gas storage level in the recondenser 30. [

Reference numeral 801 denotes a liquefied gas supply valve that can control the flow rate supplied to the recondenser 30 and the total amount of flow returned to the liquefied gas storage tank 10.

The re-condenser level control unit 83 controls the opening degree of the liquefied gas recovery valve 802 to increase when the level of the liquefied gas inside the recondenser 30 is higher than the preset level, When the level of the liquid gas is lower than the predetermined level, the opening of the liquefied gas recovery valve 802 can be controlled to be decreased. Here, the flow rate for adjusting the opening of the liquefied gas recovery valve 802 can be controlled through the numerical value measured by the liquefied gas discharge flow rate sensor 835.

In the embodiment of the present invention, the control of the internal pressure and the internal water level of the recondenser 30 is controlled by the control of the liquefied gas And the internal pressure of the liquefied gas storage tank 10 is controlled through the evaporation gas so that the control efficiency of the re-condenser 30 and the liquefied gas storage tank 10 (When materials having different physical properties are applied as control variables, the application parameters are different from each other, and thus, a separate physical property comparison table is required, which is complicated. For example, when the liquefied gas and the evaporation gas are used as control variables, when the amount of the evaporation gas is decreased by increasing the amount of the liquefied gas, Haeyaham there is a liquefied gas properties comparison table) different from the control amount should be classified This boil-off gas must each other

The oil separator 90 is provided at the downstream (downstream) of the evaporative gas compressor 40 on the evaporative gas discharge line L2 and can separate the oil in the evaporative gas discharged from the evaporative gas compressor 40.

As a result, in the embodiment of the present invention, the mixing of the oil into the evaporative gas introduced into the recondenser 30 can be shut off from the source, the recondensing efficiency of the recondenser 30 can be increased and the driving reliability of the recondenser 30 can be improved There is an effect that can be improved.

As described above, the gas processing system 1 according to the present invention can effectively supply liquefied gas and / or evaporated gas from the liquefied gas storage tank 10 to the customers 71 and 72, thereby enhancing system stability and reliability.

FIG. 4 is a conceptual view of a ship including a gas processing system according to a fourth embodiment of the present invention, and FIG. 5 is a conceptual view of a ship including a gas processing system according to a fifth embodiment of the present invention.

4 and 5, a gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a boosting pump 20, a recondenser 30, an evaporative gas compressor The high-pressure vaporizer 60, the first customer 71, the second customer 72, the control unit (not shown), the evaporation gas discharge valve 112, the evaporation gas separation valve (not shown) 113).

In the embodiment of the present invention, the same reference numerals are given to the same or corresponding components as those of the previously described embodiment, and redundant description thereof will be omitted. That is, in the embodiment of the present invention, only the control unit, the evaporation gas discharge valve 112, and the evaporation gas separation valve 113 are different in configuration from the embodiment described in FIG. 1 to FIG.

Hereinafter, a gas processing system 1 according to an embodiment of the present invention will be described with reference to Figs. 4 and 5. Fig.

The evaporation gas discharge valve 112 is provided so as to be close to the liquefied gas storage tank 10 on the evaporation gas discharge line L2 and the evaporation gas generated in the liquefied gas storage tank 10 through the opening degree control So that it can be supplied to the discharge line L2.

The evaporation gas discharge valve 112 may be connected to a control unit, which will be described later, in a wired or wireless manner, and may receive the opening adjustment signal from the control unit to perform opening adjustment.

The evaporation gas separation valve 113 is provided at a position where the evaporation gas supply line L4 is branched on the evaporation gas discharge line L2 and may be a three-way valve. The evaporation gas separation valve 113 is controlled such that the evaporation gas discharged from the evaporation gas compressor 40 is supplied to the second customer site 72 via the evaporation gas supply line L4 or the evaporation gas discharge line L2 to the re-condenser 30. The re-

The evaporation gas isolation valve 113 may be connected to the control unit through a wire or wireless connection, and may receive the opening adjustment signal from the control unit to perform the opening adjustment.

4 and 5, the control of the recondenser 30 can be implemented according to the load information of the first customer 71 in the embodiment of the present invention implemented through the control unit.

Referring to FIG. 4, an embodiment of the present invention implemented through a control unit will be described.

4, when the load signal from the first customer 71 is received and the load of the first customer 71 is high, the controller opens the opening signal to the evaporation gas discharge valve 112, 20 to send a pump drive signal so that the recondenser 30 can receive both evaporative gas and liquefied gas from the liquefied gas storage tank 10 so that the recondensed liquefied or evaporated gas To be supplied as the fuel of the first customer (71).

The control unit receives the load signal from the first customer 71 and transmits an opening closing signal to the evaporation gas discharge valve 112 when the load of the first customer 71 is low, Condenser 30 to supply only the liquefied gas from the liquefied gas storage tank 10 to supply the liquefied gas stored in the recondenser 30 to the fuel of the first customer 71, The liquefied gas storage tank 10 can be controlled so that the generated evaporated gas remains in the liquefied gas storage tank 10 to be accumulated. Of course, in this case, the driving of the evaporative gas compressor 40 can be stopped.

That is, in the embodiment of the present invention, when the load of the first customer 71 is high, that is, when the load of the MEGI engine is high, the liquefied gas and the evaporated gas are all supplied from the liquefied gas storage tank 10, 30 to effectively treat the evaporated gas generated in the liquefied gas storage tank 10 and to use the recondensed liquefied gas or evaporated gas as the fuel for the MEGI engine (the first customer 71). Here, when the load of the first customer 71 is high, for example, the ship may be propelled at a high speed (18 knots or more).

At this time, the liquefied gas or the evaporated gas supplied to the recondenser 30 has a pressure of about 6 to 8 bar, and the recondensed liquefied gas or the evaporated gas supplied to the first customer 71 is pressurized to a pressure of about 200 to 400 bar Lt; / RTI >

When the load of the first demander 71 is low, that is, when the load of the MEGI engine is low, the re-condenser 30 receives the liquefied gas only from the liquefied gas storage tank 10 and supplies the liquefied gas stored in the recondenser 30 And the evaporated gas generated in the liquefied gas storage tank 10 can be accumulated so as to remain in the liquefied gas storage tank 10 as it is.

At this time, the recondenser 30 does not perform the recondensation process but merely stores the liquefied gas temporarily, and the suction drum (Suction Drum) before being supplied to the high-pressure pump 50 that satisfies the effective suction head condition of the high- And is not supplied with evaporative gas from the liquefied gas storage tank 10. [

When the load of the MEGI engine is high (for example, when the ship is propelled at a high speed (18 knots or more)), the amount of liquefied gas stored in the liquefied gas storage tank 10 is large (when the ship is propelled at high speed, The amount of evaporated gas generated due to the increase in the amount of stored liquefied gas as the propellant fuel is increased in the early stage or the middle stage. As a result, the internal pressure of the liquefied gas storage tank 10 rises and the durability is weakened or the risk of damage is increased. Therefore, the evaporation gas treatment becomes difficult.

Therefore, in the embodiment of the present invention, it is solved by using the recondenser 30 to consume the evaporation gas as the fuel of the MEGI engine, thereby optimizing the use of the evaporation gas without wasting the processing of the evaporation gas, It is possible to efficiently and resiliently control the internal pressure of the battery.

In the case where the load of the MEGI engine is low (for example, when the ship is propelled at low speed (16Knot or less), or when the ship is ported in & out or anchoring (cargo loading or unloading)), the stored liquefied gas (In the case of propelling a ship at a low speed or in the case of a port in & out or anchoring, the storage amount of the liquefied gas as the propellant fuel is small since it is at the end of navigation) It is not necessary to separately treat the evaporation gas.

Therefore, when the load of the MEGI engine is low, it is possible to optimally use the liquid gas storage tank 10 without accumulation of evaporated gas, without waste of evaporation gas, Can be efficiently and flexibly managed.

Next, an embodiment of the present invention implemented through a control unit will be described with reference to FIG.

When the load of the first customer 71 is high, the control unit receives the load signal from the first customer 71 and outputs an opening opening signal to the evaporation gas discharge valve 112 and an evaporation gas supply signal to the evaporation gas separation valve 113 The opening signal on the line L4 side and the opening signal on the side of the evaporation gas compressor 40 and on the recondenser 30 are transmitted to the boosting pump 20 so that the recondenser 30 is supplied to the liquefied gas storage tank 10 can supply both the evaporated gas and the liquefied gas so that the liquefied gas or the evaporated gas recycled in the recondenser 30 can be supplied to the fuel of the first customer 71. [

When the load of the first customer 71 is low and the load signal is received from the first customer 71, the control unit outputs an opening opening signal to the evaporation gas discharge valve 112, evaporation of the evaporation gas separation valve 113, The re-condenser 30 sends a pump drive signal to the gas supply line L4 side opening opening signal, the evaporation gas compressor 40 side and the opening degree closing signal on the re-condenser 30 side, So that only the liquefied gas can be supplied from the storage tank 10 and the evaporated gas generated in the liquefied gas storage tank 10 can be supplied to the second customer 72 for processing.

In this case, even when the load of the first customer 71 is low, the evaporative gas compressor 40 is driven and the compressed evaporative gas is supplied to the second customer 72.

In the embodiment of FIG. 5, there is a difference between the embodiment of FIG. 4 and the driving method when the load of the first demander 71 is low. This is because when the accumulating method is not allowed in the liquefied gas storage tank 10, It may be the case that it is desired to consume all the evaporated gas generated in the gas storage tank 10.

5, when the load of the first customer 71 is low, the evaporative gas generated in the liquefied gas storage tank 10 flows through the evaporative gas discharge line L2 to the evaporative gas compressor 40, The refrigerant is supplied to the second consumer site 72 via the branched evaporation gas supply line L4 instead of the recondenser 30. [

At this time, the evaporated gas generated in the liquefied gas storage tank 10 is converted into a steam form by operating the DF boiler in the second customer 72, and thereby the surplus evaporated gas can be efficiently used without waste .

Thus, the gas treatment system 1 according to the present invention can treat the evaporative gas through the recondenser 30 to prevent waste of the liquefied gas and ensure optimum use, It is possible to reduce the construction cost of the system and to make efficient use of space in the ship.

FIG. 6 is a conceptual view of a ship including a gas treatment system according to a sixth embodiment of the present invention, and FIG. 7 is a conceptual view of a ship including a gas treatment system according to a seventh embodiment of the present invention.

6 and 7, a gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a boosting pump 20, a recondenser 30, an evaporative gas compressor (Not shown), a shaft generator 91, a clutch 92, a vaporizer (not shown), a high pressure pump 50, a high pressure vaporizer 60, a first customer 71, a second customer 72, A discharge valve 112, and an evaporation gas separation valve 113.

In the embodiment of the present invention, the same reference numerals are given to the same or corresponding components as those of the previously described embodiment, and redundant description thereof will be omitted. That is, in the embodiment of the present invention, the configurations of the control unit, the shaft generator 91, and the clutch 92 are different from those of the embodiment described in Figs.

Hereinafter, the gas processing system 1 according to the embodiment of the present invention will be described with reference to Figs. 6 and 7. Fig.

The shaft generator 91 is coupled with the propeller shaft and is interlocked with the propeller shaft. The shaft generator 91 generates power by receiving power from the first customer 71 and supplies the power to an energy storage system (not shown) Power can be stored in energy form. At this time, the shaft generator 91 gives resistance to the driving of the first customer 71 (here, the first customer 71 may be the MEGI engine) , It is possible to increase the output of the MEGI engine to consume the liquefied gas or the evaporated gas without increasing the speed.

The shaft generator 91 is connected to an energy storage facility by a power supply line (not shown) so as to supply power generated by the shaft generator 91, and a converter (not shown) Is provided to convert the electric power generated in the shaft generator 91 into electric power required by the energy storage facility.

The clutch 92 is provided on the propeller shaft to block or connect the power generated by the first customer 71 to the propeller. In the embodiment of the present invention, the clutch 92 can be used as a general clutch used in a ship, which is known in the art and omits a detailed description of the construction.

Here, the clutch 92 may be provided between the shaft generator 91 and the propeller. When receiving the engagement signal from the control unit, which will be described later, the clutch 92 transmits the power generated by the first customer 71 to the propeller, When receiving the release signal, it is possible to prevent the power generated in the first customer 71 from being transmitted to the propeller.

The propeller of which power transmission is interrupted by the clutch 92 is naturally rotated or stopped by the sea water due to the inertia of the ship in the straight forward direction. At this time, all the power generated by the first customer 71 is transmitted to the shaft generator 91, .

6 and 7, the control of the shaft generator 91, the clutch 92 and the recondenser 30 can be implemented in accordance with the propulsion information of the ship in the embodiment of the present invention implemented through the control unit.

Referring to FIG. 6, an embodiment of the present invention implemented through a control unit will be described.

The control unit transmits an opening opening signal to the evaporation gas discharge valve 112 and a pump driving signal to the boosting pump 20 regardless of whether or not the ship has received propulsion information and the re-condenser 30 is connected to the liquefied gas storage tank 10 Condensed liquefied gas or vaporized gas in the recondenser 30 can be supplied to the fuel of the first consumer 71 by allowing both the evaporated gas and the liquefied gas to be supplied to the first consumer 71, And the shaft generator 91 can transmit a drive signal regardless of whether the propulsion information of the ship is received or not so that the first demand source 71 and the shaft generator 91 can be continuously driven.

That is, through the control of the control unit, the re-condenser 30 is supplied with the evaporated gas pressurized at about 6 to 8 bar through the evaporative gas compressor 40, The liquefied gas or the evaporated gas may be supplied to the first customer 71 as high-pressure gasified by the high-pressure pump 50 and the high-pressure vaporizer 60 . At this time, since the first demand source 71 continuously receives the fuel, the power is continuously generated, and the generated power can be supplied by the shaft generator 91 and continuously produced.

However, if the propulsion signal of the ship is received from the outside and the propulsion signal of the ship is received, the control unit transmits the engagement signal to the clutch 92 to transmit the power generated in the first demanding place 71 to the propeller, And when the propulsion signal of the ship is not received, the release signal is transmitted to the clutch 92 to block the transmission of the power generated in the first customer 71 to the propeller so that the ship is not propelled Can be controlled.

That is, when the control unit receives the propulsion signal of the ship, the propeller and the first customer 71 are connected through the clutch 92 to use the power generated in the first customer 71 for propelling the ship, When the propeller is disconnected from the first demand place 71 through the clutch 92 and the first demand place 71 is disconnected from the first demand place 71 when the propulsion signal of the ship is not received, All of the power can be used to generate electric power through the shaft generator 91.

In this case, when the propulsion signal of the ship is received, it is preferable that the ship is propelled at about 18 knots or more, and when the propulsion signal of the ship is not received, it may be anchoring (cargo loading or unloading).

As described above, in the embodiment of the present invention, the shaft generator 91 can be always driven irrespective of the propulsion of the ship, thereby improving the reliability of power supply and enabling efficient production of electric power. It is possible to efficiently and economically use the evaporated gas by converting it into electric power instead of discharging it or burning it and reproducing it with other energy.

Next, an embodiment of the present invention implemented through a control unit will be described with reference to FIG.

The control unit transmits an opening opening signal to the evaporation gas discharge valve 112 to control the evaporation gas compressor 40 to compress the evaporation gas generated in the liquefied gas storage tank 10 regardless of whether or not the ship is receiving propulsion information .

When the propulsion signal of the ship is received from the outside, the control unit sends a pump drive signal to the booster pump 20 and an opening of the evaporation gas supply line L4 to the evaporation gas separation valve 113, The recondenser 30 sends a closing signal and a drive signal to the evaporation gas compressor 40 side and the opening opening signal to the recondensing device 30 and to the first customer 71 and the shaft generator 91, Condensed liquefied gas or vaporized gas in the re-condenser 30 by supplying the evaporated gas and the liquefied gas from the evaporator 10 to the first consumer 71 to drive the first consumer 71, And the generated power can be controlled so that the ship can be propelled while generating electric power through the driven shaft generator 91. [

When the propulsion signal of the ship is not received from the outside and the propulsion signal of the ship is not received, the control unit outputs a pump driving stop signal to the booster pump 20, a side of the evaporation gas compressor 40 to the evaporation gas separation valve 113, A drive stop signal is transmitted to the first customer 71 and a drive signal is transmitted to the second customer 72 and a drive signal is transmitted to the first customer 71 and the second customer 72. [ The supply of the fuel to the first customer 71 is stopped to stop the operation of the first customer 71 and the evaporation gas generated in the liquefied gas storage tank 10 is supplied to the second customer 72, It can be controlled to generate steam at the customer (72; DF boiler). At this time, the DF boiler of the second demander 72 can produce electric power through the evaporation gas. (In this case, if the second demander 72 is the DFDG, the electric power can be produced through the evaporation gas.)

Here, when the ship's propulsion signal is received, it is preferable that the ship propels at about 18 knots or more, and when it does not receive the propulsion signal of the ship, it may be anchoring (cargo loading or unloading).

As described above, in the embodiment of the present invention, when the ship is propelled, the shaft generator 91 is driven to generate electric power, and when the ship is not propelled, the DFDG is driven to generate electric power, There is an effect that the reliability of the supply is improved and the efficiency and economical use of the evaporation gas can be enabled by converting the evaporation gas into electric power or steam instead of discharging it to the outside or burning it and reproducing it with other energy.

As described above, the gas treatment system 1 according to the present invention can treat the evaporation gas through the recondenser 30 to prevent waste of the liquefied gas and ensure optimized use, It is possible to reduce the construction cost of the system and to use the space in the ship efficiently.

In addition, regardless of whether or not the ship is propelled, the shaft generator 91 is continuously driven even when the ship is not propelled through the clutch 92, or when the ship is not propelled through the DF boiler or DFDG, The electric power can be continuously produced irrespective of the situation, and the processing of the surplus evaporated gas can be converted into electric power, so that the economical use of the evaporated gas is enabled.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: gas treatment system 2: hull
10: Liquefied gas storage tank 112: Evaporative gas discharge valve
113: Evaporative gas separation valve 20: Boosting pump
30: Re-condenser 301: Packing part
302: spray part 40: evaporative gas compressor
50: high pressure pump 60: high pressure vaporizer
71: First Demand Point 72: Second Demand Point
801: Liquefied gas supply valve 802: Liquefied gas recovery valve
803: Re-condenser first pressure regulating valve 804: Re-condenser second pressure regulating valve
805: evaporation gas control valve 806: evaporation gas supply valve
807: internal pressure control three-way valve 81: tank internal pressure control section
82: Re-condenser internal pressure control unit 83: Re-condenser level control unit
831: Evaporative gas flow rate measurement sensor 832: Liquefied gas flow rate measurement sensor
833: Re-condenser internal pressure measuring sensor 834: Re-condenser water level measuring sensor
835: liquefied gas discharge flow rate sensor 836: storage tank internal pressure measuring sensor
90: Oil separator 91: Shaft generator
92: clutch
L1: liquefied gas discharge line L1a: liquefied gas upper connection line
L1b: Liquefied gas lower connection line L1c: Liquefied gas branch line
L2: evaporation gas discharge line L3: liquefied gas supply line
L4: Evaporative gas supply line L5: Evaporative gas control line
L6: Liquefied gas return line L7: Evaporated gas branch line

Claims (17)

A first flow path in which liquefied gas stored in the liquefied gas storage tank is supplied to an upper portion of the recondenser;
A second flow path in which liquefied gas stored in the liquefied gas storage tank is supplied to a lower portion of the recondenser;
A third passage through which the evaporated gas generated in the liquefied gas storage tank is supplied to the recondenser; And
And a control unit for controlling the flow of the liquefied gas in the first flow path and the second flow path in accordance with the internal pressure of the re-condenser, thereby controlling the internal pressure of the re-condenser. The apparatus according to claim 1,
And supplies the evaporated gas generated in the liquefied gas storage tank to the recondenser in accordance with the internal pressure of the liquefied gas storage tank. 3. The apparatus of claim 2,
Further comprising a packing part for recondensing the evaporated gas supplied through the third flow path and the liquefied gas supplied through the first flow path,
The first flow path is connected to the upper portion of the packing portion of the recondenser,
And the second flow path is connected to the lower part of the packing part of the recondenser. The method of claim 3,
A first valve provided in the first flow path;
A second valve provided in the second flow path; And
Further comprising a re-condenser internal pressure measuring sensor for measuring the internal pressure of the recondenser,
Wherein,
And adjusts the opening of the first and second valves in accordance with the internal pressure of the recondenser measured through the recondenser internal pressure measuring sensor. 5. The apparatus of claim 4,
Controls the opening degree of the first valve to be greater than the opening degree of the second valve when the internal pressure of the recondenser is higher than the preset pressure,
And controls the opening degree of the first valve to be less than the opening degree of the second valve when the internal pressure of the recondenser is lower than the preset pressure. The method according to claim 1,
Further comprising a fourth flow path connecting the recondenser and the customer,
The above-
A first user who is supplied with the liquefied gas from the recondenser and connected to the fourth flow path; And
And a second customer for consuming and consuming the evaporated gas from the recondenser. The method according to claim 6,
A fifth flow passage for connecting the second customer and the re-condenser; And
And a third valve provided on the fifth flow path. 8. The apparatus of claim 7,
When the internal pressure of the recondenser is higher than a preset pressure, opening of the third valve is opened to control the evaporative gas flowing into the recondenser through the fifth flow passage to be supplied to the second customer . The method according to claim 6,
The first customer is a high pressure gas injection engine (MEGI)
And the second demand point is a low pressure boiler (DF boiler). The method of claim 3,
Further comprising a spraying unit disposed above the packing unit inside the recondenser and connected to the first flow path to spray the liquefied gas supplied from the first flow path to the packing unit. The apparatus according to claim 1,
Wherein the first flow path is branched from the first flow path. 12. The method of claim 11,
An internal pressure regulating three-way valve installed at a branch point between the first flow path and the second flow path and including an inlet opening and an outlet opening to the first and second flow paths; And
Further comprising a re-condenser internal pressure measuring sensor for measuring the internal pressure of the recondenser,
Wherein,
And the degree of opening of the three-way valve is adjusted in accordance with the internal pressure of the recondenser measured through the internal pressure measuring sensor of the recondenser. 13. The apparatus according to claim 12,
Controlling the three-way valve so that the outflow opening into the first flow path is opened more than the outflow opening into the second flow path when the internal pressure of the recondenser is higher than the preset pressure,
Pressure regulating three-way valve to the first flow passage is controlled to be smaller than the outflow opening degree to the second flow passage when the internal pressure of the recondenser is lower than the preset pressure. system. The method according to claim 1,
A fourth flow path connecting the recondenser and the customer;
An evaporative gas compressor provided on the third flow path and for pressurizing evaporative gas generated in the liquefied gas storage tank;
A boosting pump for supplying the liquefied gas stored in the liquefied gas storage tank to the recondenser;
A high pressure pump provided on the fourth flow path for pressurizing the liquefied gas supplied from the recondenser to a high pressure; And
Further comprising a high-pressure vaporizer provided on the fourth flow path for vaporizing the liquefied gas supplied from the high-pressure pump. 15. The method of claim 14,
Further comprising an oil separator provided at a downstream end of the evaporative gas compressor on the third flow passage for separating the oil in the evaporative gas discharged from the evaporative gas compressor. 16. The method according to any one of claims 1 to 15,
And a gas treatment system. 16. The method according to any one of claims 1 to 15,
The first flow path is a liquefied gas upper connection line,
The second flow path is a liquefied gas lower connection line,
The third flow path is a vapor gas discharge line,
The fourth flow path is a liquefied gas supply line,
The fifth flow path is an evaporation gas supply line,
Wherein the control unit is a recondenser internal pressure control unit,
Wherein the first valve is a first internal pressure regulating valve of the recondenser,
The second valve is a second internal pressure regulating valve of the recondenser,
And the third valve is an evaporation gas supply valve.

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